Two harbor porpoises (Phocoena phocoena) washed up on an eastern Belgian shore on September 24, 2011. The porpoises were still bleeding when they were collected, indicating that their deaths were recent. There were bite marks on the bodies, which scientists compared to the mouths and teeth of potential predators. The prime suspects, based on the necropsies, were gray seals (Halichoerus grypus), researchers reported in 2012 [pdf].